In classic sibling rivalry, Kylie won't let her and the two descend into an argument, with an incredulous Kendall saying: "You’re just literally the biggest f****** b**** I’ve ever met."

She goes on to say to Kylie’s dogs: "I’m sorry your mom is such a c***."

Kendall and Kylie appeared to have made up by the time they made it to the ESPY Awards (Photo: FilmMagic)

Admitting the argument is petty she later tells the camera that perhaps emotions of the night got to them.

“It’s just annoying ’cause this night is already stressful as it is. I really just wanna show that we support our dad. So we don’t need to be fighting over outfits. I mean, maybe that’s why we’re fighting over something so stupid," Kendall added.

This season is set to be one of the most dramatic ever. Not only do we see the family continue to deal with Caitlyn's transition, but Kourtney and Scott's break-up will also be featured.

Kylie's boyfriend Tyga is also set to make his KUWTK debut as he joins the family on a trip to St Barts.